Jyoti was right - aside from knowing Kabir's close relationship w/ his nani, and his strained relationship w/ his dad, she knows nothing about them. She's never met them, doesn't know anybody, doesn't have their numbers, nothing. She was searching her phone for contacts, but she knows that she has nobody of his there. She should have instead asked for Kabir's phone, looked for anybody resembling a dad, and called him.
In short, Jyoti knows Kabir's views on his family, but not the family itself. I think that if she marries him and the serial continues after that, she might play a key role in re-uniting him w/ his family, and being a great bahu to them as a result.